. Bulletin. Science; Natural history; Natural history. 112 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 6- 12- le- as- 30- 38- iS- 53- 60- 76- 91- 107- 122- 137- 1 so- les- 180- 215- 246- 27S-. ^^^^^ 5r^> -^^ ^ >v ^H^ ix >N ^^^ Fig. 3. Bathymetric ranges (| i) reported for species in the Hueneme Shelf hydroid assemblage and their zones of dominance (//////) in the stud>' area. Listing order corresponds to depth relationships. it captures the settling lan-^ae. Also, the probable relative paucity of suspended prey species and organic detritus in this quiescent environment may limit hydroi
. Bulletin. Science; Natural history; Natural history. 112 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 6- 12- le- as- 30- 38- iS- 53- 60- 76- 91- 107- 122- 137- 1 so- les- 180- 215- 246- 27S-. ^^^^^ 5r^> -^^ ^ >v ^H^ ix >N ^^^ Fig. 3. Bathymetric ranges (| i) reported for species in the Hueneme Shelf hydroid assemblage and their zones of dominance (//////) in the stud>' area. Listing order corresponds to depth relationships. it captures the settling lan-^ae. Also, the probable relative paucity of suspended prey species and organic detritus in this quiescent environment may limit hydroid success. Shell material is also an important substrate for several local hydroid species, as noted by previous authors (, Fraser 1912; Naumov 1960). Clytia baked is strongly associated with Pismo clams {Tivela stultorum) and bean clams (Donax gouldii) (Torrey 1904). The depth ranges of these clams (Fitch 1950; Ricketts and Calvin 1968) overlap substantially with the zone of dominance of C bakeri. Phialella Irugosa and Lovenella nodosa were observed primarily on fragments of sand-dollar tests and were generally restricted to the depth range of sand-dollar beds. Monobrachium parasitum was observed only at the deepest stations (55 m) on the clam Axinopsida serricata. As Axinopsida was also seen at all 36-m stations and half of those at 27 m, the upper limits of Monobrachium must be imposed by some factor other than substrate. Another factor of undoubtedly great importance in determining the distribution of hydroids is food availability. Hyman (1940) states that hydroids are "chiefly carnivorous, ingesting any small animal of appropriate size that happens to come in contact with the ; However, in addition to small live animals such as larvae, crustaceans, nematodes and other worms, "newly dead animals or portions thereof are also ; She further discusses several experiments in which hydroids were induced to ingest bits of sponge, gelatin,
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